The researchers designed a special cap for the user. This head cover picks up the signals from the scalp(头皮) and sends them to a computer. The computer interprets the signals and commands the motorized wheelchair. The wheelchair also has two cameras that identify objects in its path. They help the computer react to commands from the brain.

　　Prof. Millan, the team leader, says scientists keep improving the computer software that interprets brain signals and turns them into simple commands. “The practical possibilities that BCI technology offers to disabled people can be grouped in two categories:　communication, and controlling devices. One example is this wheelchair.”

　　He says his team has set two goals. One is testing with real patients, so as to prove that this is a technology they can benefit from. And the other is to guarantee that they can use the technology over long periods of time.

　　1. BCI is a technology that can　.　

　　A. help to update computer systems

　　B. link the human brain with computers

　　C. help the disabled to recover

　　D. control a person’s thoughts

　　2. How did Tavella operate the wheelchair in the laboratory?

　　A. By controlling his muscles.

　　B. By talking to the machine.

　　C. By moving his hand.D. By using his mind.

　　3. Which of the following shows the path of the signals described in Paragraph 5?

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